Air-heating attachment for stoves.



S. M. MARTIN.

' AIR HEATING ATTACHMENT FOR STOVES.

APPLICATION FILED APR.2I. I918.

TTE STTEd SAMUEL III. MARTIN, OF SIDNEY, OHIO.

AIR-HEATING ATTACHMENT FOB, STOVES.

Specification of Letters Patent.

Patented Dec. 1'7, 1918.

Application filed April 27, 1918. Serial No. 231,217.

Z '0 aZZ whom it may concern:

Be it known that I, SAMUEL M. MARTIN, a citizen of the United States, residing at Sidney, in the county of Shelby and State of Ohio, have invented certain new and useful Improvements in Air-Heating Attachments for Stoves; and I herebydeclare that the following is a full, clear, and exact descrip tion thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is an improvement in heating stoves, and its object is to provide such stoves with an attachment which will greatly increase their heating capacity, thereby economizing fuel and also reducing the size of stove required to heat a given sized room.

I will explain the embodiment of the invention illustrated in the accompanying drawings to enable others to understand and use the same, and refer to the claims following this description for summaries of the essential features of the invention and combinations of parts for which I desire protection.

In said drawings:

Figure l is a part front elevation and part section of an ordinary stove, showing my attachment in vertical cross section.

Fig. 2 is a top plan view of the stove with the attachment in position.

The stove 1 may be of any desired suitable construction, being shown as preferably of the ordinary cylinder type, and usually such stoves are made with a top opening covered by a plate; and my invention is particularly applicable to such stoves, as the attachment is to be suspended in the upper part of the stove and is inserted through such opening; the plate being removed and laid aside when the attachment is used.

The attachment comprises a drum or cylinder 2 closed at its lower end but open at top, and its upper end substantially conforms in diameter to the opening in the top 1 of the stove, when the plate top, (not shown) is removed. The up er end of the drum is pro vided with an exterior peripheral flange 2 adapted to rest upon the top 1 around the opening therein, as indicated in Fig. 1, thus suspending the drum 2, open end uppermost, within the body 1 of the stove as shown.

The drum 2 may be made of thin sheet metal to facilitate transmission of heat through its walls to the air within the drum.

To protect the lower part of the drum from direct contact with the flames in the fire chamber below it, said end may be covered by a metal cap 3 which may also be of heavy sheet metal if desired, and which may be attached to the drum by bolts or rivets indicated at 3 or other suitable means.

To admit air into the lower part of the drum and facilitate circulation of air there through I preferably connect the lower end of the drum with an air pipe or tube 7 which may lead out through the wall of the stove and be connected therewith in any suitable manner. As shown in Fig. 1 the inner end of the air pipe 7 extends through suitable openings in the cap and drum and is secured thereto by an interior nut and washer 7 7 and an exterior nut and washer 7, 7*, and the outer end of pipe 7 is shown as detachably secured to the wall of the stove by interior and exterior nuts 7 and 7 This construction enables the heating attachment to be readily attached to or detached from an ordinary heating stove.

To disseminate and distribute the air in the drum and increase the heating elfect I preferably place within the drum an annulus which may be made of sheet metal, and be suspended within the drum by metal straps 4? having their lower ends attached to the annulus and their upper ends 4 bent outwardly so as to engage the top of the flange 2* and thus suspend the ring axially of, and at the desired height within the drum 2. I

Within the annulus 4 is a distributer 5 which may be formed of coils or convolutions preferably formed of sheet metal, and the distributor is suspended axially within the annulus by means of straps 5 having their upper ends 5 bent angularly outward so as to engage the upper edges of ring l and suspend the distributer 5 therein as indicated in the drawings.

Fresh air may be admitted if desired into the stove above the fire chamber and adjacent the drum by means of a pipe 8 having a threaded end 8 entered through a suitable opening in the wall of the stove and secured by a nut 8*. If desired the outer end of the pipe 8 may be connected by a coupling 8 to an air supply pipe, not shown, to bring fresh air from outside the room to support combustion in the stove.

When the attachment is applied to an ordinary stove as shown it is suspended therein above the grate, and the hot products of combustion rise and strike and surround the drum, having to pass through the annular chamber or space between the drum and walls of stove in order to reach the usual exit or outlet indicated at 6. The drum 2 is subjected to the most intense heat on all sides and bottom, so that the air therein is highly heated by contact with the hot walls of the drum, and by contact with thehot annulus 4: and distributer 5 within the drum; which are heated by conduction and convection from the walls of the drum. The hot air will rise and cool air enter the drum and be heated and rise, sov that a constant current of hot air is discharged from the drum; and the velocity of the air current and circulation is enhanced by using the air pipe 7.

What I claim is:

1. A heating attachment for a stove having an opening in its, top;. comprising a drum closed at bottom and open at top and having a peripheral top flange adapted to engage the edges of opening in the top of the stoveand suspend the drum within thestove, and an air distributer' suspended Within the drum and comprising an annulus and coils Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

or convolutions removably suspended within the annulus. 2. A heating attachment for a stove having an opening in its top; comprising a drum closed at bottom and open at top and having a peripheral top flange adapted to engage the edges of the opening in the top of the stove and suspend the drum within the stove, a cap fitted over the lower end of the drum to protect same and an air distributer comprising coils or convolutions removably suspended within the drum,

8. A heating attachment for astove having an opening in its top; comprising a drum closed at bottom and open at top and having a peripheral top flange adapted to engage the edges of the drum within the stove; an air pipe detachably connected with the lower end of the drum and extending outside the store through the wall thereof, and an air distributer within the drum comprising an annulus and COllS or convolut-lons within the annulus, substantially as de In testimony that I claim the foregoing as my own, I ailix my signature.

SAMUEL M; MARTIN.

Washington, D. G. 

